References
- Baker , A.J.M. 1981 . Accumulators and excluders ‐ Strategies in the response of plants to heavy metals . J. Plant Nutr. , 3 : 643 – 654 .
- Brooks , R.R. , Shaw , S. and Marfil , A.A. 1981 . Some observations on the ecology, metal uptake and nickel tolerance of Alyssum serpyllifolium subspecies from the Iberian peninsula . Vegetatio , 45 : 183 – 188 .
- Gabbrielli , R. , Pandolfini , T. , Vergnano , O. and Palandri , M.R. 1990 . Comparision of two serpentine species with different nickel tolerance strategies . Plant and Soil , 122 : 271 – 277 .
- Lehn , H. and Bopp , M. 1987 . Prediction of heavy‐metal concentrations in mature plants by chemical analysis of seedlings . Plant and Soil , 101 : 9 – 14 .
- MacNicol , R.D. and Beckett , P.H.T. 1985 . Critical tissue concentrations of potentially toxic elements . Plant and Soil , 85 : 107 – 129 .
- Morrison , R.S. , Brooks , R.R. and Reeves , R.D. 1980 . Nickel uptake by Alyssum species . Plant Science Letters , 17 : 451 – 457 .
- Neto , M.M.P.M. and de Varennes , A. 1993 . Determination of lead in white Lupin by anodic stripping voltammetry . Plant and Soil , 154 : 1 – 5 .
- Neto , M.M.P.M. , Rocha , M.M.G.S. and Brett , C.M.A. 1994 . Square wave adsorptive stripping voltammetry of molybdenum (VI) in continuous flow at a wall‐jet mercury film electrode sensor . Talanta , 41 : 1597 – 1601 .
- Sequeira , E.M. de and da Silva , A.R.P. 1992 . “ Ecology of serpentinized areas of north‐east Portugal ” . In The Ecology of Areas with Serpentinized Rocks. A World View , Edited by: Roberts , B.A. and Proctor , J. 169 – 197 . Dordrecht, , The Netherlands : Kluwer Academic Publishers .
- Universidade de Tras‐os‐Montes e Alto Douro, 5000 Vila Real, Portugal.
- CECUL‐FCUL, Calçada Bento da Rocha Cabral, 14, 1200 Lisboa, Portugal.